Chuck



:INVENTQR:

CHUCK.

Patented Dec. 29,

I(No Model.)

GESELLERS; No, 574,077."

y UNITED' STATES .PATENT @Fries GEoReEn. sELLERson RIDL'EY PARK,- PENNSYLVANIA;

SLIECIFICATION yforming part ofLettersP'atent No. 574,077, dated December 29, 1,896.

' llpplication filed June 28,1890. Serial No. 357,136. `(llo model.)`

To a/ZZ wil/bm it indy cnccrn: Be it known thatA I, GEORGE Il. SELLERS,

of. Ridley Park, Delaware county, State of part thereof. l I Y. My invention relates to a .self-centering drill-chuck especially adapted to grasp a par- Pennsylvania, have invented a new and useful Improvement in Chucks, of which the foie). lhowing is a specification, reference being had to the .accom ticular form of twist-drill, but also adapted to act as a general grasping and driving drill orlathe chuck.

g Amongthe objects of my invention is to provide a compactdrill-chuck, the ,,1frasping-` jaws of which are so arranged as to grasp and securely hold between them the anges or bands of a'special fluted drill and also, if required, to hold any form of drill or lother instrument adapted to be held in adrill or lathe chuck; also, to so arrange the grasping-jaws that they will remain in position in the chuck and notbe removed therefrom, even if not grasping or when vnot securely heldby themechanisn designed to force .the jaws into rmengagement with the drill or other object being held. l

Another obj ectof 1n yinvention is to arrange the forcing mechanism for the jaws so that 1t w1l1 have to endure no strains of'driving' or j twisting. These advantages I'l attain by the :novel devices and combinations .of devices l illustrated in the drawings, and my invention 1.

will be best understood asv described in con- Y .grasp'a special drill D. .ISO

V1,.the drill being shownentire.

' dated nection therewith..

' In said drawings, Figure l is a perspective view of the 'preferred form of my improved chuckshown grasping a drill. Fig. 2 is a longitudinal section of the chuck shown in Fig.

front View of thech'uck, the drill being shown in section. the chuck on line' of Fig. 2. Fig. 5 is a cross-section on the line y 4/ of Fig. 2, the

drill being' removed. f

A A2 represent a chuck constructed accordin g to my invention and adapted to firmly rlhis drill and the mannerof constructing the same form the subject of my Letters Patent No." 443,297, December 23, 1890. Itfis sufficient, therefore, to observe that lit consists, essen'- panying drawings, formingv "in .the chuck,

Fig. 4 is a cross-section vthrough l tially, of a Vcore D and substantially helical 'flanges or threads d2, surrounding' the core D.` -The shank `A of thechuck is vpreferably made of standard taper and has a flat ilange a-,`adapted to it a corresponding socket in a drive mechanism or in a lathe-mandrel nose.

At A' the chuck isl enlarged andextends forward, prefcrablyin' the formof a cone,

forming the .guide portionfAg. .A conical socket or cavity B, adapted to receiveV the drill, is formed in .the chuck,fand toadapt it tothe special drill D,1Ipreferably,form the conical cavity B at the rear with a cylindrical portion h' and end this with an obtuse lconical recess b2, of a shape to't the end vdof the drill.

E E represent jaws specially adapted to anydrillor suitable tool. These jaws, of

jwhic'h there are at 1east`two,`are made of a a flange, as E', anda fiat faceon the front thereof. In order to hold these jaws firmly the' drill D, but also capable of holding I preferably arrange on the- -of the chuck and are formed, preferably, with backs of the jaws-which bear against the inside ofthe cavity as c', adapted to iit in correspondingly-dove tailed grooves, as h3, in the periphery of the cavity.

It is of course obvious that the grooves may be -made in the jaws and the ribs be formed the construction shown with the chuck,"but is the one I prefer; p

O n the linside or clutching partof the jaws are arranged angcse4,whieh form sectional of the chuck beveled ribs,`

female'threads corresponding-in pitch and size to the pitch Vand size of the openings be The front of the chuck Vis threaded at a',

and fitting over it and screwingxthereon is a tween the flanges d2 on the drill D.-

forcing cap or' sleeve G, centrally perforated at G" to admit the drill D, and screw-threaded at g' to screw on the ,threaded portion'a'of the'ch-uck. In order to insure atightflt, a 'reinforce or rib, as A, is

formed around the chuek-body and the inside of the capis cut at g2 to neatly slide over the rib thethreaded portion ct'of the chuck.'

The front of the capG bears against the A3, prevents i ing dustand dirt from entering and clogging roo i j awsand forces them into the tapering cavity l but-in order to witl'idraw the jaws from the socket of the chuck positively I preferably form in the cap a groove, as G2, into which the iianges E' of the jaws E are adapted to fit. This groovealso .forms a channel for 5 any oil or grease which may run down to the lower part of the apparatus when in use. Sockets g3 for the introduction of a proper turning-tooll may be formed, as shown, in the rim G2 of the cap G, and, if desired, a counter- 1o bore t' may be made in the rear of thc chuck,

as shown in dotted lines.

Preferably four jaws are arranged in the chuck and are' Yheld therein by ribs and grooves, as explained, and when holding my special drill the iianges e4 of the-jaws project into the spaces e2 between the threads d2 of lthe drill, and the body of each jaw bears against the outeredge of the screw-threads d2, rmly holding the drill in position. As 2o the jaws are held by their ribs e', which fit into grooves l)3 in the chuck-body from lateral displacement, all the stress and strains due to driving are taken up by these jaws and the forcing-cap G is free' from all such strains and 25 has no duty but to force the jaws into position and hold them securely in Iirln contact with the drill.

If the special drill be removed, it is evident that any drill or other tool it is desired to hold 3o which isof approximately the same size as the core D' ofthe special drill can be'inserted and will be firmly held by the flanges e4 of the jaws. j

Having now described my invention, what I claim as new, and desire to secure by Letters f3 5 Patent, is-

. 1. In a chuck, the combination of a chuckbody .having a socket or cavity therein, a series of jaws E which are adapted tov slide in said cavity,.each having a flange as E', and 4o a forcing-cap having a central perforation G of substantially the same size as the drill or other object tobe grasped and provided with a groove as G3 in which the ange E is adapted .to fit, wherebythe-jaws may be given'positive 45 motion Vin both directions; the whole so` a1'- ranged, that in operation the cap will serve to protect the jaws.

2. In a chuck the combination of a chuckbody, jaws held from lateral displacement in 5o a socket as B in said body, lugs, ribs and grooves relatively arranged in the socket and jaws, and ji'anges on the inner side of thejaws forming the female part corresponding to a v drill designed to be grasped by the jaws of the 5 5 chuck. f A

j GEO. H. SELLERS. Witnesses: j

LEWIS R. DICK,

H. W. HABE PowEL. 

